st: I have a problem with xtgls hetero and serial correlation

[Rodrigo L�pez <rodrilopez88@hotmail.com>]

Hy Statalist

I have 13 observation and 15 panels unit. When I run xtgls and
xtreg, fe I have problem becuase the Stata told me that correlation
matrix is singular and It is not possible do the test. How can I do
for test serial correlation in xtgls and extreg; fe?.

My best regards
Rodrigo Lopez

_________________________________________________________________
Descubre el mayor cat�logo de coches de la Red en MSN Motor. 
http://motor.msn.es/researchcentre/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/